Improved/extened DRLM RESTful API (better error handling and control with clients)

[didacog]

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Issue details:

• Issue type (Bug / Question / Feature Request / Others?): Enhancement
• Impact (Low / High / Critical / Urgent): Low
• How often it happens (Always / Eventually): N/A
• Brief description of the issue:

For a better ReaR-DRLM management the RESTful API needs to be improved to have a good error handling between DRLM and ReaR clients with standard HTTP response codes.
Also needs to be prepared to be extended easily to support more features.

DRLM Server information:

• DRLM version (/usr/sbin/drlm -V): Future DRLM version 2.2.0

DRLM Client information:

• ReaR version (/usr/sbin/rear -V): Future ReaR version 2.1

[didacog]

With my latest commits in DRLM develop branch: 0a270ba 4a0d6fe a64bc89 5137aa8 a79d272

And the merged PR rear/rear#1252

From ReaR 2.1 (current snapshot) and DRLM 2.2.0 (current develop branch) there is a better error handling from client side (ReaR), also new/clients/ID/log resource has been added (see issue #58) and is prepared to support ReaR multiple configurations rear -C confname.

This change is backwards compatible for previous ReaR versions (since 1.17).

Regards,

[didacog]

All tests went OK, closing the issue.